Toolholder



April 10, 1945.

TOOL HOLDER Filed May 21 1942 lmmmm I II 2 I II I I I I I I I INVENTOR.BY 71 1,

JZi'reiErz'clsozz ATTORNEYS Patented Apr. 10, 1945 UNITED STATES" PATENTt e 'roouromma I Alfred Erickson, Chicago, Ill. Application May :21,1942, sena1NoQ44a950 6 Claims. (01482-35) My invention relates tocutting-off tools as used in lathes and similar machines, and moreparticularlyto holders for such tools, and my main object is to providea holder which prevents'the tool from becoming jammed or deformed by theresistance of the work. i

A further-object of the invention is to provide atool of the abovecharacter which uses the work as a 'basis or support to maintain it atthe proper cutting level. j

' Another object of the invention is .to provide a holder with positivemeans for resisting the rotative tendency of the work to crowd or jamthe tool. a

A still further object of the invention is to pro.- yic'le a tool holderwhich adapts itself to the-running course or characteristic of the work,whereby to be in harmony with the same.

.Another object of the invention is to design the novel tool holderalong lines of simplicity, ease of control and adjustment and directadaptability to the conventional tool post of the lathe.

With the above objects in view and any others which may suggestthemselves from the descrip- .tion to follow, a better understanding ofthe invention may be had by reference to the accompanying drawing, inwhich-- ,Figure 1 is aside elevation of the novel tool holder,illustrating its application;

Fig. 2 is a plan view of the holder and tool; enlarged and partly brokenaway;

Fig. 3 is a front end view of the same; and Fig.4 is a, fragmentalsection of the same taken on the line 4-4 of Figure 1.

Referring specifically to the drawing, a conventional cutting-01f toolis shown at [0 and a typical piece of work at II, full lines in Figure 1indicating that the tool has cut into the work to a considerable extent.

Ordinarily, a cutting-on tool is held in a, boxclamp supported by theconventional tool post. However, the improved holder makes the boxclampunnecessary, since the holder is directly clamped in the tool post aswill be explained.

The holder i primarily built with a base 12 extended rearwardly with atail piece l3. The latter receives a bar l4 along one side, while thebase and tail piece are recessed in the other side as indicated at l5-toseat the tool l0 to a depth slightly less than its thickness.

The tai1 piece l3 receives the sunken head l6 of a bolt I1, whichextends through the bar M to interposed between the tail piece and .thebar -in the region of the bolt. i The base It receives a fiat;approximately square :block 1.9 on the sidecorresponding to the .bar 14,and a similar block 20 on the opposite "side. The block 20 i verticallyrecessed along its inner face, as indicated at 2|, to seat a post 122 to.a, .depth slightly less than its thickness, the .upper portion ofthepost being extended with-a forward finger 23. While the bottom of thelatter is horizontal, the top tapers to a rounded 'ex-- tremity, asindicated at 2A, for compactness and to save'm-etal.

When the base and blocks are assembled as shown, the tool ID and post 22make contact in the area of their intersection; and in order to retainthe tool and post, the base and blocks are bound together by a set ofbolts 25 applied to the corner region of the assembly. Thus, while theblock I'9and base l2 arebored in alinement at 25 and 21 for the freepassage of the bolts, the block 20 is tapped in continuation'of thesebores for the end portions of the bolts 25 to-thread into the block 20.The adjustment of the bolts is such that the tool It! and the post 22are disposed in snugly sliding relation in the assembly of the base andblocks.

When the tool is tobe put in use, the bar 14 is simply slid into thetool post 28 of the lathe. and the set screw 29 thereof tightened whenthe approximate initial position of the tool in relation to the work isdetermined. The tool is then ad justed to contact the work II in thmanner inreceive a securing nut 18. A fibre washer I So is dicated byfinely-dotted lines in Figure 1. Such lines also indicate that thefinger 23 of the post 22 reaches to a point over the center of the work.The vertical adjustment of the post is intended to adapt the finger 23to over-lie the work, whatever the initial diameter of the same may be.The fingerwill thus be of a sufiicient length to reach to the topcenter, or beyond the top center, of work within a given range of sizes,it being essentialin all instances that the finger over-lie the topmostregion of the work. When the assembly has been arranged as in Figure l,but with the tool I 0 and post 22 in the initial positions as indicatedby finely-dotted lines, the adjustmeni; may be fixed by the applicationof a suitable key-wrench (not shown) to a socket screw and post 22 tothe said base. It is thus possible to adjust the position of the tooland the post finger 23 to the position and size of the work II by thesimple and powerful control of the socket screw 30. 4

Since the tool 10 is at one side of the finger 23, it will be obviousthat the latter remains on top of the work while the tool advances andproceeds with the cutting-ofi operation, so that the tool can at no timebe influenced or forced downwardly by the rotative tendency or pressureof the work-as suggested by the arrow in Figure 1- when a heavy cut istaken. The post finger 23 1ftherefore acts as a positive suspension forthe Sing the work to counteract its own tendency to jam or deform thetool.

The holder is also adjusted by means of the nut I8 to allow a limitedpivotal motion on the 4 part of the tool assembly in relation to thesupporting bar M, the intermediate washer 8a. providing only sufiicientplay for the said assembly to descend of its own weight in relation tothe bar. Thus, the finger rests on the work I l at all times, and thetool accommodates itself to any fluctuations or eccentricities in therotation of the work. It will be evident from the above description thatI have provided a holder for cutting-01f tools which allows forhorizontal, vertical and pivotal adjustments of its vital elements whilegrouping the parts of the holder into a neat and compact assembly.Further, this assembly is in the nature of a unit quickly and easilyadaptable to the standard tool post of the lathe, so thatits connectionto the same should be self-evident even sembly of fewand simple partswhich are devoid of complications and do not require undue skill .oraccuracy for the production of the holder, so

that the same becomes a useful and desirable I piece of equipment inconjunction with the lathe or other machine to which it may be applied.

While I have described the novel tool holder along specific lines, it isapparent that minor changes or refinements may be made therein withoutdeparting from its principle. Thus, it may be used. with a tool forradius or lateral cutting, with the finger 23 modified to retain itsheight along the original or basic portion of the work during travel andso keep the cutting edge of the tool at center level. This and othermodifications are feasible tothe skilled artisan and should be withinthe scope and spirit of the appended claims.

I claim:

1. A holder for a cutting-off or similar tool applicable at center levelto work rotatable in a lathe, comprising a supporting base receiving thetool on one side, a block applied to the remote side of the tool, a postrising between the block and the tool with a substantially horizontalprojection positioned to rest on a portion of the work laterally of thecutting path, a companion block on the other side of the base, means tobind the blocks to the base to retain trial longitudinal adjustments ofthe tool and post, and means carried by the companion block to fix saidadjustments.

2. A holder for a cutting-off or similar tool applicable at center levelto work rotatable in a lathe, comprising a supporting base receiving the"tool on one side, a block applied to the remote side of the tool, apost rising between'the block and the tool with a substantiallyhorizontal projection positioned to rest on a portion of the worklaterally of the cutting path, a companion block on the other side ofthe base, means to bind the blocks to the base to retain triallongitudinal adjustments of the tool and post, and means carried by thecompanion block to simultaneously urge the base and the first-mentionedblock to-- justments of the tool and post, and means carried by thecompanion block to simultaneously draw the first-mentioned block towardand push the support from the companion block, whereby to clamp the tooland post and fix said adjustments.

4. The structure of claim 1, said means to bind comprising a set ofbolts freely directed through the companion block and the support tothread into the first-mentioned block.

5. The structure of claim 1, said means to fix comprising a screwthreaded into the companion block to bear against the support.

6. The structure of claim 1, said means to bind comprising pairs ofbolts freely directed through the companion block and the supportclearing opposite edges of the post and tool to thread into thefirst-mentioned block, and said means to fix comprising a screw threadedinto a substantially medial portion of the companion block to bearagainst the support. 1

v ALFRED ERICKSON.

